The software that allows users to type a "SarcMark," designed by Sarcasm, Inc., retails for $1.99. In a release, the company describes how the SarcMark will fill an important punctuation void, that I'd bet you didn't know existed.

Statements have the period. Questions have the question mark. Exclamations have the exclamation mark. When you see the newest punctuation mark for sarcasm, you'll know the writer of that sentence doesn't literally mean what they're writing; they're being sarcastic.